EightBit/LR35902/inc/LR35902.h
2022-01-17 19:10:15 +00:00

149 lines
5.3 KiB
C++

#pragma once
#include <cstdint>
#include <cassert>
#include <IntelProcessor.h>
#include <Signal.h>
#include <Register.h>
namespace EightBit {
namespace GameBoy {
class Bus;
class LR35902 final : public IntelProcessor {
public:
enum StatusBits {
ZF = Bit7,
NF = Bit6,
HC = Bit5,
CF = Bit4,
};
LR35902(Bus& memory);
Signal<LR35902> ExecutingInstruction;
Signal<LR35902> ExecutedInstruction;
[[nodiscard]] const register16_t& AF() const noexcept final;
[[nodiscard]] auto& AF() noexcept { return IntelProcessor::AF(); }
[[nodiscard]] const register16_t& BC() const noexcept final;
[[nodiscard]] auto& BC() noexcept { return IntelProcessor::BC(); }
[[nodiscard]] const register16_t& DE() const noexcept final;
[[nodiscard]] auto& DE() noexcept { return IntelProcessor::DE(); }
[[nodiscard]] const register16_t& HL() const noexcept final;
[[nodiscard]] auto& HL() noexcept { return IntelProcessor::HL(); }
bool& IME() noexcept { return m_ime; }
[[nodiscard]] uint8_t enabledInterrupts() noexcept;
[[nodiscard]] uint8_t flaggedInterrupts() noexcept;
[[nodiscard]] uint8_t maskedInterrupts() noexcept;
Signal<EventArgs> MachineTicked;
void tickMachine(const int extra) { for (int i = 0; i < extra; ++i) tickMachine(); }
void tickMachine() { tick(4); MachineTicked.fire(); }
protected:
int execute() noexcept final;
int step() noexcept final;
void handleRESET() noexcept final;
void handleINT() noexcept final;
void memoryWrite() noexcept final;
uint8_t memoryRead() noexcept final;
void pushWord(register16_t value) noexcept final;
void jr(int8_t offset) noexcept final;
int jumpConditional(int condition) noexcept final;
int returnConditional(int condition) noexcept final;
int jrConditional(int condition) noexcept final;
void ret() noexcept final;
private:
Bus& m_bus;
register16_t af = 0xffff;
register16_t bc = 0xffff;
register16_t de = 0xffff;
register16_t hl = 0xffff;
bool m_ime = false;
bool m_stopped = false;
bool m_prefixCB = false;
[[nodiscard]] uint8_t R(int r);
void R(int r, uint8_t value);
[[nodiscard]] register16_t& RP(int rp) noexcept;
[[nodiscard]] register16_t& RP2(int rp) noexcept;
[[nodiscard]] static constexpr auto adjustHalfCarryAdd(uint8_t f, const uint8_t before, const uint8_t value, const int calculation) noexcept {
return setBit(f, HC, calculateHalfCarryAdd(before, value, calculation));
}
[[nodiscard]] static constexpr auto adjustHalfCarrySub(uint8_t f, const uint8_t before, const uint8_t value, const int calculation) noexcept {
return setBit(f, HC, calculateHalfCarrySub(before, value, calculation));
}
[[nodiscard]] static bool convertCondition(uint8_t f, int flag) noexcept;
static uint8_t subtract(uint8_t& f, uint8_t operand, uint8_t value, int carry = 0) noexcept;
void executeCB(int x, int y, int z, int p, int q);
void executeOther(int x, int y, int z, int p, int q);
[[nodiscard]] static uint8_t increment(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t decrement(uint8_t& f, uint8_t operand) noexcept;
void stop(bool value = true) noexcept { m_stopped = value; }
void start() noexcept { stop(false); }
[[nodiscard]] bool stopped() const noexcept { return m_stopped; }
void di() noexcept;
void ei() noexcept;
void reti();
void jrConditionalFlag(uint8_t f, int flag);
void returnConditionalFlag(uint8_t f, int flag);
void jumpConditionalFlag(uint8_t f, int flag);
void callConditionalFlag(uint8_t f, int flag);
[[nodiscard]] register16_t add(uint8_t& f, register16_t operand, register16_t value);
[[nodiscard]] static uint8_t add(uint8_t& f, uint8_t operand, uint8_t value, int carry = 0) noexcept;
[[nodiscard]] static uint8_t adc(uint8_t& f, uint8_t operand, uint8_t value) noexcept;
[[nodiscard]] static uint8_t sbc(uint8_t& f, uint8_t operand, uint8_t value) noexcept;
static uint8_t andr(uint8_t& f, uint8_t operand, uint8_t value) noexcept;
[[nodiscard]] static uint8_t xorr(uint8_t& f, uint8_t operand, uint8_t value) noexcept;
[[nodiscard]] static uint8_t orr(uint8_t& f, uint8_t operand, uint8_t value) noexcept;
[[nodiscard]] static void compare(uint8_t& f, uint8_t operand, uint8_t value) noexcept;
[[nodiscard]] static uint8_t rlc(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t rrc(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t rl(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t rr(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t sla(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t sra(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t srl(uint8_t& f, uint8_t operand) noexcept;
static void bit(uint8_t& f, int n, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t res(int n, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t set(int n, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t daa(uint8_t& f, uint8_t operand) noexcept;
static void scf(uint8_t& f, uint8_t operand) noexcept;
static void ccf(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t cpl(uint8_t& f, uint8_t operand) noexcept;
[[nodiscard]] static uint8_t swap(uint8_t& f, uint8_t operand) noexcept;
};
}
}